Functional Block Diagrams - Thermal Arc ARCMASTER 300S Service Manual

5
Funct i onal B l ock D i agram s
Figure 2-2 illustrates the functional block diagram of the 300TS and 400TS power supply. Figure 2-3 illus-
trates the functional block diagram of the 300S and 400S power supply.
Input Main
Input
Circuit
Diode
Switch
Power
Filter
Input Main
Input
Circuit
Diode
Switch
Power
Filter
IGBT Main
Capacitor
Inverter T ransformer
(PCB14)
DC Power
Thermal
Detector
Primary
Voltage
Sensor
Thermal
To each control circuit Drive
Sensor
+/-15VDC +18VDC
Circuit
Circuit
+24VDC +5VDC
Primary
Trouble
Sensing Current
Circuit Sensor
Sequence
T orch Control
Control
Connection
(CON1)
Current
Adjustment Adjustment &
circuit Mode select Switches
Panel Circuit Board
Fi gur e2-2: 300/ 400TS M odel Funct i onal Bl ock Di agr am
IGBT Main
Capacitor
Inverter T ransformer
(PCB14)
DC Power
Thermal
Detector
Primary
Voltage
Sensor
Thermal
To each control circuit Drive
Sensor
+/-15VDC +18VDC
Circuit
Circuit
+24VDC +5VDC
Primary
Trouble
Sensing Current
Circuit Sensor
Sequence
T orch Control
Control
Connection
(CON1)
Current
Adjustment
circuit Mode select Switches
Panel Circuit Board
Fi gur e 2-3: 300/ 400S M odel Funct i onal Bl ock D i agr am
300/ 400TS and 300/ 400S
Output
Diodes
T hermal
Detector
Output
Inductor
HF-UNIT Stick Mode Lift T ig Mode
Control VRD Output Short
Circuit Sensing Sensing
Circuit Circuit
+ -
Fan Control
Circuit
Gas Control
Circuit
Reference
Output
Diodes
T hermal
Detector
Output
Inductor
Stick Mode Lift T ig Mode
VRD Output Short
Sensing Sensing
Circuit Circuit
+ -
Fan Control
Circuit
Reference
Adjustment &
2 – 4
2
I N TR O D U C TI O N
Hall Current
+
Transformer
(HCT1)
-
Coupling
Coil
High
Frequency
Unit
Fan
Solenoid
Hall Current
+
Transformer
(HCT1)
-
Fan